Another difference I believe is that film is logarithmic in response,
that is to say that doubling the exposure will increase the density
(blackness) by something like 0.3, whereas digital sensors are linear.
Since exposure is measured logarithmically in stops, this means that a
digital camera will have half of its brightness steps distributed within
the brightest stop of exposure, 1/4 of them within the next brightest
stop etc. Also the colour channels do not have the same sensitivity, and
the in-camera processing will copy brightness values between colours for
each pixel to maximise the exposure latitude.
Jonas
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